his own struggles with one of them. >> "action news"'s sharrie williams spent sometime with jeremiah trotter. >> reporter: trotter simply said not to know who you are or where you are, it is as scary as it sound. he experienced that, researchers have barely scratched the surface in understanding the long term effects effects of concussion bus grade strides in diagnosing them. hard hit during a college game saturday has concussions and player safety in the head line once again. >> this does in the look good. >> reporter: this head left university of michigan quarterback shane morris physically shaken. >> he can barely stand up. >> they have to get him out of the ballgame. >> while michigan is front and center on the question on protecting its players, former philadelphia eagles jeremiah trotter spoke firsthand about the the dangers of concussions. >> i can remember two where i was rendered unconscious. >> reporter: this conversation is part of the series in connection with the franklin institute's new brain exhibit, trotter says that pressure to play through concussions resonates from the pla